Mitsubishi MELSEC-Q Series User Manual page 170

4
COMMUNICATIONS BETWEEN CPU MODULES
(3) Precautions
Basic
Note4.6
Basic
Note4.7
Note6
Basic
Note4.6
Note7
Basic
Note4.7
4
- 20 4.1 Communications between CPU modules using CPU shared memory
4.1.2 Communication by auto refresh using CPU shared memory
(a) Local device setting
Device ranges set for the use of the auto refresh cannot be set to local devices.
If set, the refresh data will not be updated.
(b) Setting for using the same file name as the program in the file register
Do not set devices for the use of the auto refresh in the file register for each
program.Note7
If set, auto refresh will be performed on the file register that corresponds to the
last scan execution type program executed.
(c) Assurance of data sent between CPUs
The old data and the new data may be mixed in each CPU due to the timing of
sending data from the host CPU and auto refresh in the other CPU.
The following shows the method to realize the data consistency of the user data in
the communication by the auto refresh.
1) Data consistency for 32 bit data
Since the data transmission by the auto refresh mode can be set in units of 32
bits only, data separation for 32 bits data will not occur.
The Basic model QCPU does not have any local device.
Since the file register in the Basic model QCPU is fixed, file register cannot be set for each
program.
Note4.6
Note6
Note4.7